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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc8488b2e9b2100ad951460cb7b8c9da6d04262eb98d95a1a554e63aa780e1e' 
  AND token = 'sDRtHESBYxugtR9agUJS7r94cmhfVr2vdyloqb0U7zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}